参数主动控制的痕量气体实时在线测量系统
Real-Time and On-Line Measurement System for Trace Gas with Active Control Parameters
查看参考文献15篇
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文摘
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基于二极管激光波长调制光谱技术建立了一套参数主动控制的痕量气体实时在线探测系统。为提高系统的实时在线测量性能和测量精度,在模拟温度与压强对痕量气体浓度探测影响的基础上,待测气体的温度、压强和流量被主动控制,并能保持长期稳定性。小波去噪和卡尔曼滤波数字降噪技术被联合应用于系统。以CO_2分子吸收为例的实验结果表明,小波去噪的应用将吸收光谱的信噪比提高了30%左右,卡尔曼滤波的应用将CO_2体积分数的测量精度由2.5×10~(-7)提高至7×10~(-8)。Allan方差结果给出了系统的稳定时间,约为60s。实测实验室内CO_2浓度的结果表明,该测量系统具有良好的稳定性和可靠性,能够很好地监测痕量气体浓度的变化。 |
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其他语种文摘
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Based on diode laser wavelength modulation spectroscopy technique,a set of real-time and on-line measurement system for trace gases is established with active control parameters.In order to improve the performance of real-time and on-line measurement and the detection precision of the system,after a theoretical simulation of the effects of temperature and pressure on the measurement concentration,we actively control the temperature,pressure and mass flow of gas,and they can keep long-term stability.Moreover,the digitized techniques of wavelet denoising and Kalman filtering are jointly applied to the system.CO_2 molecular absorption experimental results show that the signal-to-noise ratio of the absorption spectrum is improved by about 30% with the application of wavelet denoising,and the application of Kalman filter improves the measurement precision of concentration from 2.5×10~(-7) to 7×10~(-8).The stable time of the system given by Allan variance is about 60s.The results obtained by measuring the concentration of CO_2in laboratory indicate that the system has good stability and reliability,and it can monitor the concentration change of trace gas very well. |
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来源
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光学学报
,2018,38(5):0530003-1-0530003-7 【核心库】
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DOI
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10.3788/AOS201838.0530003
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关键词
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光谱学
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激光吸收光谱
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二次谐波
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痕量气体
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浓度反演
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地址
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1.
安徽工程大学数理学院, 安徽, 芜湖, 241000
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中国科学院大气成分与光学重点实验室, 中国科学院大气成分与光学重点实验室, 安徽, 合肥, 230031
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安庆师范大学物理与电气工程学院, 安徽, 安庆, 246011
4.
中国科学院安徽光学精密机械研究所大气物理化学研究室, 安徽, 合肥, 230031
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0253-2239 |
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学科
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物理学;环境质量评价与环境监测 |
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基金
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国家重点研发计划
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国家自然科学基金
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中国科学院青年创新促进会项目
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安徽省高校省级自然科学研究项目
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文献收藏号
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CSCD:6243258
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